Mercurial > hg > nginx-quic
view src/misc/ngx_google_perftools_module.c @ 7832:ad3a6f069498 quic
Added proper handling of connection close phases.
There are following flags in quic connection:
closing - true, when a connection close is initiated, for whatever reason
draining - true, when a CC frame is received from peer
The following state machine is used for closing:
+------------------+
| I/HS/AD |
+------------------+
| | |
| | V
| | immediate close initiated:
| | reasons: close by top-level protocol, fatal error
| | + sends CC (probably with app-level message)
| | + starts close_timer: 3 * PTO (current probe timeout)
| | |
| | V
| | +---------+ - Reply to input with CC (rate-limited)
| | | CLOSING | - Close/Reset all streams
| | +---------+
| | | |
| V V |
| receives CC |
| | |
idle | |
timer | |
| V |
| +----------+ | - MUST NOT send anything (MAY send a single CC)
| | DRAINING | | - if not already started, starts close_timer: 3 * PTO
| +----------+ | - if not already done, close all streams
| | |
| | |
| close_timer fires
| |
V V
+------------------------+
| CLOSED | - clean up all the resources, drop connection
+------------------------+ state completely
The ngx_quic_close_connection() function gets an "rc" argument, that signals
reason of connection closing:
NGX_OK - initiated by application (i.e. http/3), follow state machine
NGX_DONE - timedout (while idle or draining)
NGX_ERROR - fatal error, destroy connection immediately
The PTO calculations are not yet implemented, hardcoded value of 5s is used.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Thu, 23 Apr 2020 13:41:08 +0300 |
parents | a27e0c7e198c |
children |
line wrap: on
line source
/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> /* * declare Profiler interface here because * <google/profiler.h> is C++ header file */ int ProfilerStart(u_char* fname); void ProfilerStop(void); void ProfilerRegisterThread(void); static void *ngx_google_perftools_create_conf(ngx_cycle_t *cycle); static ngx_int_t ngx_google_perftools_worker(ngx_cycle_t *cycle); typedef struct { ngx_str_t profiles; } ngx_google_perftools_conf_t; static ngx_command_t ngx_google_perftools_commands[] = { { ngx_string("google_perftools_profiles"), NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1, ngx_conf_set_str_slot, 0, offsetof(ngx_google_perftools_conf_t, profiles), NULL }, ngx_null_command }; static ngx_core_module_t ngx_google_perftools_module_ctx = { ngx_string("google_perftools"), ngx_google_perftools_create_conf, NULL }; ngx_module_t ngx_google_perftools_module = { NGX_MODULE_V1, &ngx_google_perftools_module_ctx, /* module context */ ngx_google_perftools_commands, /* module directives */ NGX_CORE_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ ngx_google_perftools_worker, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static void * ngx_google_perftools_create_conf(ngx_cycle_t *cycle) { ngx_google_perftools_conf_t *gptcf; gptcf = ngx_pcalloc(cycle->pool, sizeof(ngx_google_perftools_conf_t)); if (gptcf == NULL) { return NULL; } /* * set by ngx_pcalloc() * * gptcf->profiles = { 0, NULL }; */ return gptcf; } static ngx_int_t ngx_google_perftools_worker(ngx_cycle_t *cycle) { u_char *profile; ngx_google_perftools_conf_t *gptcf; gptcf = (ngx_google_perftools_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_google_perftools_module); if (gptcf->profiles.len == 0) { return NGX_OK; } profile = ngx_alloc(gptcf->profiles.len + NGX_INT_T_LEN + 2, cycle->log); if (profile == NULL) { return NGX_OK; } if (getenv("CPUPROFILE")) { /* disable inherited Profiler enabled in master process */ ProfilerStop(); } ngx_sprintf(profile, "%V.%d%Z", &gptcf->profiles, ngx_pid); if (ProfilerStart(profile)) { /* start ITIMER_PROF timer */ ProfilerRegisterThread(); } else { ngx_log_error(NGX_LOG_CRIT, cycle->log, ngx_errno, "ProfilerStart(%s) failed", profile); } ngx_free(profile); return NGX_OK; } /* ProfilerStop() is called on Profiler destruction */